58 lines
2.8 KiB
C
58 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/limits.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/zip.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Returns pointer to zip central directory of current executable.
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*/
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struct Zipos *__zipos_get(void) {
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static struct Zipos zipos;
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static bool once;
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const char *exe;
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size_t mapsize;
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uint8_t *cdir;
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void *map;
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if (!once) {
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exe = (const char *)getauxval(AT_EXECFN);
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if ((zipos.fd = open(exe, O_RDONLY)) != -1) {
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if ((mapsize = getfiledescriptorsize(zipos.fd)) != SIZE_MAX &&
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(map = mmap(NULL, mapsize, PROT_READ, MAP_SHARED, zipos.fd, 0)) !=
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MAP_FAILED) {
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if ((cdir = zipfindcentraldir(map, mapsize))) {
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zipos.map = map;
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zipos.cdir = cdir;
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} else {
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munmap(map, mapsize);
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}
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}
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}
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once = true;
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}
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return zipos.cdir ? &zipos : NULL;
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}
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